package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * @Author: 廖卓斯
 * @CreateTime: 2024-10-17
 * @Description:
 * @Version: 1.0
 */

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和口味
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        //涉及多个数据表操作 做到数据一致性 :开启事务注解

        //一次在菜品表插入一条数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //在口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //开启分页查询
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        //返回值为DishVO 其中含有分类的名称
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 菜品批量删除
     *
     * @param ids
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品能否删除 ---1.是否在起售--status==1
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //说明菜品在起售中 不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //2.菜品是否被套餐关联
        List<Long> setmealIds = setmealDishMapper.getStemealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //说明 菜品被套餐关联
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的 菜品
        /*for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除口味数据
//            根据菜品id直接尝试删除
            dishFlavorMapper.deleteByDishId(id);
        }*/

        //根据id批量删除 菜品数据
        //优化 sql ：delete from dish where id in()
        dishMapper.deleteByIds(ids);
        //批量删除口味数据
        //优化 sql ：delete from dish_flavor where dish_id in()
        dishFlavorMapper.deleteByDishIds(ids);

    }

    /**
     * 根据菜品id查询菜品对应口味数据
     *
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //将数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息 和口味信息
     *
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //修改菜品表基本信息
        dishMapper.update(dish);
        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //在口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 条件查询菜品和口味
     *
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d, dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 根据分类id查询菜品
     *
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 根据id 和status 修改菜品的状态
     *
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        if (status == 1) {
            //修改为起售
            Dish dish = Dish.builder()
                    .id(id)
                    .status(StatusConstant.ENABLE)
                    .build();
            dishMapper.update(dish);
        } else if (status == 0) {
            //修改为停售
            Dish dish = Dish.builder()
                    .id(id)
                    .status(StatusConstant.DISABLE)
                    .build();
            dishMapper.update(dish);
        }


    }
}
